JP2008136543A - Fire extinguishing equipment with highly expandable foam and method of foaming for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent reduction of the foaming ratio related to fire extinguishing equipment with highly expandable foam and a method of foaming for the equipment used for a pit in an oil tank, a culvert in a petrochemical complex, or in a cabin or hold, etc. <P>SOLUTION: The fire extinguishing equipment with highly expandable foam comprises a foam generating part 3 with an emission nozzle 9 and an air intake part 5 for feeding air K in an emission section 1 to the foam generating part 3. The air intake part 5 has an auxiliary nozzle 10 for increasing the quantity of sucked air K. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a high expansion foam fire extinguishing equipment and a foaming method thereof used in oil tank pits, oil complex culverts, cabins, holdhouses, and the like. The present invention relates to an expanded foam fire extinguishing equipment and a foaming method thereof.

  In the foam fire extinguishing equipment, the foam aqueous solution is discharged from the radiation nozzle, blown into the foaming net and blown in by sucking air, and the fire source is filled with the foam to extinguish the suffocation. The foam fire extinguishing equipment includes a low foaming fire extinguishing equipment and a high foaming (high expansion foam) fire extinguishing equipment.

  In both the fire extinguishing equipments, the foaming ratio is different, for example, the foaming ratio of the low foaming fire extinguishing equipment is 20 or less, and the foaming ratio of the high expansion foam fire extinguishing equipment is 80 or more and less than 1000. Here, the expansion ratio refers to the volume ratio between the aqueous foam solution and the generated foam.

  In order to generate highly expanded bubbles, for example, bubbles with an expansion ratio of 500 or more, it is necessary to take in a large amount of air from the upstream side of the radiation nozzle. The method (called “outside air”) is generally used.

  However, in this outside air, since outside air is used, a duct is penetrated in the building, or a bubble generator is provided by making a hole in the partition wall. .

  Therefore, in order to solve the above problem, a high-expansion foam fire extinguishing equipment of a system (referred to as “inside air”) that sucks air in a compartment that discharges bubbles is used (for example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 6-165837

  In the high expansion foam fire extinguishing equipment of inside air, the foaming ratio may not be as designed depending on the quantity and quality of smoke generated at the time of fire. For example, when the designed foaming ratio is 500, the actual foaming ratio is 100. When the expansion ratio is reduced in this manner, it is impossible to completely cover the fire source with the bubbles, so that the suffocation can not be effectively performed. The reason why the expansion ratio is lowered will be described in detail later, but it is mainly the presence of smoke in the air.

  In view of the above circumstances, an object of the present invention is to prevent a reduction in expansion ratio.

  The present invention is a high expansion foam fire extinguishing equipment comprising a foaming part having a radiation nozzle and an air suction part for supplying air from the discharge section to the foaming part; An auxiliary nozzle for increasing the suction amount is provided.

  The auxiliary nozzle of the present invention is characterized by injecting water or an aqueous foam solution. The injection pressure of the auxiliary nozzle of the present invention is larger than that of the radiation nozzle.

  The present invention is a high expansion foam fire extinguishing equipment comprising a foaming part having a radiation nozzle and an air suction part for supplying air from the discharge section to the foaming part, wherein the air suction part includes the air A foam expansion method using a high-expansion foam extinguishing equipment provided with an auxiliary nozzle for increasing the suction amount of the air; the radiation nozzle and the auxiliary nozzle are simultaneously activated, and the air in the discharge section is supplied to the air suction unit And the foam aqueous solution discharged from the radiation nozzle is caused to collide with a foaming net for foaming.

  The auxiliary nozzle of the present invention is characterized in that an aqueous foam solution is ejected, and the aqueous foam solution collides with the foaming net and foams.

  Since the present invention is configured as described above, sufficient air necessary for foaming can be obtained by driving the radiation nozzle and the auxiliary nozzle at the same time even if the ejection pressure of the radiation nozzle is lower than the standard set pressure. The air can be sucked into the air suction unit. Therefore, as described above, the spray pressure of the radiation nozzle can be reduced, and the speed of the foam aqueous solution released can be made lower than the standard set speed, so that a desired foaming rate can be obtained.

  When the foam aqueous solution is ejected from the auxiliary nozzle, the foam aqueous solution collides with the foaming net and foams. For this reason, even when the amount of the aqueous solution jetted is reduced as the radiation pressure of the radiation nozzle decreases, the amount of the aqueous foam solution supplied to the foaming portion is almost the standard amount because the aqueous foam solution is also ejected from the auxiliary nozzle. . Therefore, a desired amount of bubbles can be obtained in a predetermined time.

  When foam aqueous solution or water is ejected from the auxiliary nozzle, smoke (liquid fine particles) mixed in the suction air is adsorbed to the water droplets, so that clean air can be supplied to the foaming portion.

  The present inventor researched and experimented on the cause of the decrease in the expansion ratio of the high expansion foam fire extinguishing equipment, and found that "smoke" had the main cause. This smoke is generated in the chamber (foam discharge section) due to the occurrence of a fire, but floats in the room as liquid fine particles, for example, fine particles having a particle diameter of 1 μm or less. When the fine particles are mixed in the air of the discharge section and sucked into the air suction part, they are supplied together with the air to the foaming part, and the foaming ratio is reduced.

  The present inventor has realized that it is only necessary to remove the smoke particles in order to solve the above problem, but it may be possible to prevent the reduction of the expansion ratio without removing it. Thought.

  Generally, a foam such as a highly expanded foam is a two-layer film of a surfactant contained in a foam stock solution, and is composed of an inner thin film and an outer thin film that sandwich a hydrophilic region. However, it is said that it will hold air and become a foam. And, the present inventor said that if there is foreign matter such as smoke particles, the foaming rate is not good. The formation speed of the two thin films becomes slow, and when the radiation nozzle is operated at the standard set pressure, It was thought that this was because the speed of the droplets of the aqueous foam solution was so high that the two thin films could not be formed side by side and would pass through the mesh.

  As a solution to the above problem, it is conceivable that the jet pressure is made lower than the standard set pressure to lower the jet speed of the radiating nozzle so that the droplets of the foam aqueous solution do not easily pass through the mesh. Therefore, when the foaming state of the foam aqueous solution having a predetermined concentration was changed by changing the spray pressure of the radiation nozzle, the foaming ratio was reduced to 1/5 or less compared to normal when the spray pressure was 0.5 MPa. And at 0.2Mpa, it decreased only to about 4/5.

  In this way, when the radiation pressure of the aqueous foam solution is reduced, foaming is facilitated, but the amount of air suction and the amount of aqueous radiation bubble solution are less than the standard settings. For this reason, the foaming amount is reduced, and a desired foaming amount cannot be obtained within a predetermined time.

  Therefore, the present inventor provided an auxiliary nozzle in the air suction portion and increased the amount of suction air, and was able to obtain a desired expansion ratio. The present invention has been made based on the above findings.

An embodiment of the present invention will be described with reference to FIG.
A room (chamber) 1 which is a foam discharge section is provided with a highly expanded foam fire extinguishing equipment. The fire extinguishing equipment has, for example, a foaming ratio of 500, and includes a foaming unit 3 and an air suction unit 5 that supplies air to the foaming unit 3.

  The foaming portion 3 is formed in a cylindrical shape or a rectangular tube shape, and a foaming net (net) 7 is stretched at the tip thereof, and the inside thereof is opposed to the net 7 with a gap. A plurality of radiation nozzles 9 are provided. The radiation nozzle 9 is connected to a mixer (not shown) that generates an aqueous foam solution.

The air suction part 5 is formed by a duct having the same diameter as the foaming part 3, and a plurality of auxiliary nozzles 10 are provided on the inlet side. The auxiliary nozzle 10 has a function of injecting the aqueous foam solution and sucking the air in the discharge section 1 into the air suction portion 5. The injection pressure of the auxiliary nozzle 10 is set larger than that of the radiation nozzle 9, for example, the discharge pressure of the radiation nozzle 9 is 0.15 to 0.3 Mpa, and the injection pressure of the auxiliary nozzle 10 is 0.6 to 0.8. MPa.
Note that the spray pressure of the radiation nozzle 9 is smaller than the standard set pressure that is normally used, and therefore the flow rate of the sprayed aqueous solution is also slower than the standard set speed.

Next, the operation of this embodiment will be described.
When a fire occurs in the room 1, a fire detector (not shown) detects the fire and sends a fire signal to the control panel. Then, the control panel activates the high expansion foam fire extinguishing equipment and injects the foam aqueous solution from the radiation nozzle 9 and the auxiliary nozzle 10, so that suction force is generated.

  Then, the air K in the discharge section 1 is sucked from the air suction part 5 and the water droplet-shaped foam aqueous solution w discharged from the radiation nozzle 9 and the auxiliary nozzle 10 collides with the foaming net 7 and is refined. Inhale air and foam. The bubble 12 falls toward the fire source and covers the fire source. Therefore, the suffocation extinction of the fire source, cooling extinguishing, etc. are performed.

  At this time, since the radiation nozzle 9 is operated at a pressure smaller than the standard setting pressure in order to suppress the flow rate of the aqueous foam solution, the amount of air sucked by the radiation nozzle 9 is smaller than that in the standard operation. Since the air is also sucked by the auxiliary nozzle 10 that is operated at a pressure higher than 9, the air sucking portion 5 can secure a sufficient amount of air necessary for foaming. Moreover, since the foam aqueous solution w sprayed from the auxiliary nozzle 10 also collides with the foaming net 7 and foams, the necessary foaming amount can be obtained. The foam aqueous solution ejected from the auxiliary nozzle is in the form of water droplets and adsorbs smoke particles in the air sucked into the air suction part. For this reason, clean air can be supplied to the foaming portion, which facilitates foaming.

  The embodiment of the present invention is not limited to the above. For example, instead of discharging the aqueous foam solution from the auxiliary nozzle, water may be ejected.

It is a front view which shows the Example of this invention.

Explanation of symbols

1 room 3 foaming part 5 air suction part 7 foaming net 9 radiation nozzle 10 auxiliary nozzle K air H smoke

Claims (5)

A high expansion foam fire extinguishing equipment comprising a foaming part having a radiation nozzle and an air suction part for supplying air from the discharge section to the foaming part;
A high-expansion foam fire extinguishing facility, wherein an auxiliary nozzle for increasing the amount of air suction is provided in the air suction portion.   The high expansion foam fire extinguishing equipment according to claim 1, wherein the auxiliary nozzle sprays water or an aqueous foam solution.   The high expansion foam fire-extinguishing equipment according to claim 1, wherein an injection pressure of the auxiliary nozzle is larger than that of the radiation nozzle. A foaming method using the high expansion foam fire extinguishing equipment according to claim 1, wherein the radiation nozzle and the auxiliary nozzle are simultaneously activated, and air in a discharge section is sucked into an air suction part and supplied to the foaming part. And a foaming method for a high expansion foam fire extinguishing system, wherein the foam aqueous solution discharged from the radiation nozzle is caused to collide with a foaming net and foam.   5. The foaming method for a high expansion foam fire extinguishing system according to claim 4, wherein the auxiliary nozzle ejects a foam aqueous solution, and the foam aqueous solution collides with the foaming net and foams.

Images